JP3724666B2 - Gas valve opening and closing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas valve opening / closing device used in a gas water heater, and more particularly to a water supply automatic gas valve that opens and closes a gas flow path to a burner in response to flowing water pressure.
[0002]
[Prior art]
In general, a gas water heater is provided with an automatic water supply gas valve that opens a gas flow path only when water flows to prevent empty cooking.
However, since the automatic water supply gas valve uses the flowing water pressure as an operating source, the opening and closing operation of the gas flow path is gradually caused by the level of the flowing water pressure, and a prompt opening and closing operation cannot be expected.
Further, depending on the use conditions, the flowing water pressure is not always sufficient, and the flowing water pressure for opening and closing the water supply automatic gas valve may increase and decrease, and the water supply automatic gas valve may open and close unstablely.
Therefore, like the gas valve opening / closing device described in Japanese Utility Model Publication No. 55-34379 shown in FIG. 4, the pressure ring 43 for transmitting the pushing force by the flowing water pressure downstream of the automatic water supply gas valve 40, and this pushing valve A plate-like plate spring 42 that snaps by power and a pressing collar 41 that transmits the snap operation of the plate-like plate spring 42 to the automatic water supply gas valve 40 are provided, and the plate-like plate spring only when a predetermined flowing water pressure is reached. There is known a gas valve opening / closing device that instantly opens and closes to a certain opening by transmitting 42 snap operations to the automatic water supply gas valve 40.
With this automatic water supply gas valve, a necessary opening degree can be secured at the time of ignition when the valve is opened, so that a sufficient amount of gas can be ignited, no ignition mistake occurs, and the release of raw gas can be prevented.
[0003]
[Problems to be solved by the invention]
However, in such a gas valve opening / closing device, in addition to the automatic water supply gas valve, a component for performing a snap operation, a component for performing the snap operation, and a component for transmitting this snap operation to the automatic water supply gas valve are required. It was extremely complex and expensive.
An object of the present invention is to solve the above-described problems and to provide an inexpensive gas valve opening / closing device with a simple structure by integrating a snap-operating part and a feed water automatic gas valve.
[0004]
[Means for Solving the Problems]
The gas valve opening and closing device of the present invention that solves the above problems is
A spindle that moves back and forth in response to flowing water pressure,
In the gas valve opening and closing device equipped with a water supply automatic gas valve that opens and closes the gas flow path in conjunction with the spindle,
The automatic water supply gas valve includes a disc-shaped plate spring curved in the valve closing direction, a seal portion that keeps airtightness between the spindle inserted into the center hole of the disc-shaped plate spring, and an outer peripheral side of the disc-shaped plate spring. A gas valve part that is provided in the downstream direction of the gas flow path and opens and closes the gas flow path is integrally formed,
A push fitting that pushes the plate-like leaf spring in conjunction with the spindle that moves forward by an increase in flowing water pressure, and snaps and opens the plate-like leaf spring to the upstream side; and
A reset unit that is fixed to the gas flow path, restricts the movement of the disc-shaped leaf spring that moves backward due to a decrease in flowing water pressure, and snaps the disc-shaped leaf spring curved to the upstream side to be bent downstream by snapping. And the summary.
[0005]
A gas valve opening and closing device according to claim 1 of the present invention having the above-described configuration is provided.
A disc-shaped leaf spring curved in the valve closing direction, a seal portion that keeps airtightness between the spindle inserted into the center hole of the disc-shaped leaf spring, and a gas flow provided downstream of the gas flow path on the outer peripheral side of the dish-shaped leaf spring. The gas valve portion that opens and closes the passage integrally forms a water supply automatic gas valve.
Then, the press fitting is interlocked with the spindle and moves forward by increasing the flowing water pressure to push the disc-like plate spring, and the disc-like plate spring is bent in a snap-like manner and opened.
Moreover, the reset part fixed to a gas flow path controls the movement of the plate-shaped leaf | plate spring which reverse | retreats by the reduction | decrease of flowing water pressure, and the plate-shaped leaf | plate spring curved to the upstream is snapped to curve downstream.
Accordingly, the automatic water supply gas valve opens or closes instantaneously when a predetermined flowing water pressure is reached as the flowing water pressure increases or decreases.
In addition, the water supply automatic gas valve itself is integrally formed with a plate spring that snaps, so in addition to the water supply automatic gas valve, the necessary snap operation parts are transmitted to the water supply automatic gas valve. Parts to be used can be eliminated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the gas valve opening / closing apparatus of the present invention will be described below.
FIG. 1 is a schematic view of a gas water heater as one embodiment.
The water supply path from the water inlet is provided with a faucet 19 that opens and closes the flow path by manual operation with the push button 17, and the water pressure responsive device 1 is provided downstream thereof. The water pressure responsive device 1 is provided with a diaphragm 15 that is movable back and forth, and a primary chamber 13 and a secondary chamber 12 are formed by being partitioned by the diaphragm 15.
In addition, a water governor 16 that is coaxial with the diaphragm 15 and maintains the flow rate even when the feed water pressure fluctuates is provided on the entrance to the primary chamber 13 of the water pressure actuator 1.
Further, a water amount adjusting unit 18 is provided in the flow path that continues from the primary chamber 13.
The flow path is branched in two directions by the water amount adjusting unit 18, and is branched into a heating path 28 that leads to the mixing unit 21 through the venturi 22 to the heat exchanger 23 and a bypass path 20 that directly leads to the mixing unit 21. Is done.
And the branched flow path merges at the mixing part 21 and reaches the outlet.
[0007]
The venturi 22 provided in the heating path 28 squeezes the flow path and is provided with a horizontal hole in a direction perpendicular to the flow path and communicates with the secondary chamber 12 of the hydraulic pressure actuator 1. When the water is passed through the venturi 22, the pressure in the secondary chamber 12 decreases according to the decrease in the water pressure in the lateral hole due to the venturi effect.
Accordingly, a differential pressure is generated between the primary chamber 13 and the secondary chamber 12, and a displacement force (in the left direction in the figure) is generated in the diaphragm 15 that is displaceable back and forth.
The diaphragm 15 is provided with a push shaft 14 and a spindle 3 that transmit displacement on the same axis, and a water supply automatic gas valve 4 is provided at the other end of the spindle 3. The water supply automatic gas valve 4 is energized by a V spring 5 so as to be closed in the downstream direction of the gas flow path, and the water flow allows the displacement force of the diaphragm 15 to overcome this V spring force to open the gas flow path. .
[0008]
The gas supply path to the burner 27 is provided with an instrument plug 25 that opens and closes the gas passage by manual operation with the push button 17.
Also, downstream of this, the valve is opened by interlocking with manual operation, the valve is kept open by the thermoelectromotive force of a thermocouple (not shown) during combustion, and if combustion abnormality occurs, the thermoelectromotive force is lowered and closed. A magnet type safety valve 26 is provided.
The burner 27 is provided with an electrode (not shown) that ignites the gas by electric discharge.
[0009]
The automatic water supply gas valve 4 includes a disc-shaped leaf spring 2 curved in the valve closing direction (downstream side), a seal portion 6 that inserts the spindle 3 into the center hole thereof to keep the air tight with the spindle 3, and a seat surface of the main body. A gas valve portion 7 that opens and closes the gas flow path is formed integrally with the gas flow passage 10. The seal portion 6 and the gas valve portion 7 are formed of a rubber material that can ensure airtightness.
[0010]
The spindle 3 is provided with a pusher 8 for transmitting the pushing force by the water pressure actuator 1 to the automatic water supply gas valve 4 and an E-ring 30 for fixing the pusher 8 to the spindle 3. The pressing metal 8 is provided with a fixing surface 32 for a spindle on one surface of a cylinder, and the spindle 3 is inserted into the center of the fixing surface 32 and fixed by an E-ring 30.
Further, the outer peripheral portion of the cylinder is divided and notched, and a pressing portion 33 is provided to push the disc-shaped plate spring 2 in the forward direction of the spindle 3.
The pusher 8 is moved to the back surface (downstream side) near the gas valve portion 7 of the plate-like leaf spring 2 at the position immediately before the automatic water supply gas valve 4 is opened by the spindle 3 that moves forward due to an increase in flowing water pressure. Provided.
[0011]
Moreover, the reset part 9 which controls the motion of the plate-shaped leaf | plate spring 2 (to the right of a figure) is fixed by screwing etc. inside the seat surface 10 facing the gas valve part 7 of the automatic water supply gas valve 4. To do.
Further, the reset unit 9 is brought into contact with the back surface (downstream side) closer to the center of the plate-like leaf spring 2 when the water supply automatic gas valve 4 reaches a predetermined opening degree by the spindle 3 retreating due to a decrease in the flowing water pressure. Provide in position.
[0012]
Further, a through hole 31 is provided between the reset portion 9 to be fixed and the sheet surface 10, and the push portion 33 in the press fitting 8 is movably inserted through the through hole 31 so as to be pushed to the plate-like leaf spring 2. Provide.
That is, when the pressing force of the pressing metal 8 overcomes the restoring force of the plate-shaped plate spring 2 to curve the plate-shaped plate spring 2 in the valve opening direction, and the plate-shaped plate spring 2 comes into contact with the reset unit 9, In order to bend itself in the valve closing direction by the restoring force of the disc-shaped plate spring 2, the pressing diameter of the pressing plate 8 against the disc-shaped plate spring 2 is set larger than the contact diameter of the reset unit 9.
Further, when the automatic feed water gas valve 4 is opened, the contact diameter of the V spring 5 biased to the plate-like plate spring 2 is set by the push-metal 8 so that the bending of the plate-like plate spring 2 by the push-plate 8 is not hindered. Provide smaller than the pusher diameter.
[0013]
Next, the operation of the plate-shaped leaf spring 2 that opens and closes the water supply automatic gas valve 4 will be described with reference to FIG. 3 showing the relationship between the load and the stroke, which is a characteristic diagram of the plate-shaped leaf spring 2.
The figure shows experimental data in which a load is applied to the central portion of the plate-shaped leaf spring 2 and the relationship between the applied load and the stroke (deformation amount) at which the central portion is deformed is graphed.
First, when a load is gradually applied to the plate-like leaf spring 2 that is curved in a certain direction and the reverse load (point a) is reached, the plate-like leaf spring 2 starts to deform according to the load.
Then, when a load is applied until the dead point (point b) is exceeded against the restoring force of the plate-shaped leaf spring 2, thereafter, the load required for the deformation of the plate-shaped leaf spring is abruptly decreased, so the opposite direction at a stretch. Curve (b point → c point → d point).
On the other hand, the plate-like leaf spring generates a restoring force to return to the original curved state at each stroke position.
Accordingly, when the load on the plate-shaped leaf spring 2 is gradually decreased from (d point → c point), the plate-shaped plate spring 2 starts to be gradually restored according to the load.
Then, when the load on the plate-shaped leaf spring 2 is decreased until the dead point (point c) is exceeded, thereafter, the restoring force of the plate-shaped leaf spring 2 increases rapidly and returns to the original curved state at once (point c → b point → a point).
Therefore, in order to set the automatic feed water gas valve 4 to open and close instantaneously, the valve opening start position and the valve closing start position are pointed at the point Sb where sudden deformation is repeated on the way back and forth according to the characteristic diagram of the plate-shaped leaf spring 2. Set between ~ Sc points.
In addition, since the diameter of the gas valve part 7 in the feed water automatic gas valve 4 is larger than the contact diameter by the push metal fitting 8, the actual opening degree is further expanded by the curve than the push stroke.
The required opening of the automatic water supply gas valve 4 by snapping the plate-shaped leaf spring 2 is set to an opening that can secure a gas amount that facilitates ignition and a gas amount that does not lose the flame.
[0014]
Next, operation | movement of the water supply automatic gas valve 4 in a present Example is demonstrated based on FIG. (A) shows the closed state of the automatic water supply gas valve 4, and the hydraulic pressure actuating device 4 works and the spindle 3 moves forward (to the left in the figure) as the flowing water pressure rises from this stopped state. ).
Then, the plate-shaped leaf spring 2 is pressed through the metal fitting 8, and when the predetermined pressure is reached, the plate-shaped leaf spring 2 is bent and deformed in the opposite direction in a snap-like manner, so that the water supply automatic gas valve 4 is instantly opposed. It is separated from the seat surface 10 to be pushed and pushed open to a certain opening degree (c).
Thus, the fuel gas from the gas inlet is supplied through the path from the instrument plug 25 to the magnet safety valve 26 to the automatic water supply gas valve 4 to the gas through hole 31 of the metal fitting 8 to the burner 27 (FIG. 1).
[0015]
When the automatic water supply gas valve 4 is opened, the gas flows into the burner 27, and the gas is ignited by the discharge of an igniter (not shown) provided in the burner 27, and combustion starts.
Further, as the flowing water pressure increases, the automatic water supply gas valve 4 moves, and the opening degree is fully opened (d).
[0016]
On the other hand, when the flowing water pressure decreases, the V spring 5 force and the return spring 11 force overcome the pressing force by the diaphragm 15, and the water supply automatic gas valve 4 moves in the closing direction as the spindle 3 moves in the right direction.
When the automatic water supply gas valve 4 moves to a certain degree of opening, the disc-shaped leaf spring 2 comes into contact with the reset portion 9 and restricts movement in the closing direction (c).
That is, the force of the V spring 5 is received by the reset unit 9 via the plate-like plate spring 2.
When the pushing force from the hydraulic pressure actuating device 4 is reduced to a certain value, the disc-shaped leaf spring 2 is snapped (ro) in the valve closing direction by its own restoring force. As a result, the automatic water supply gas valve 4 is instantly closed from a certain opening.
Further, when the flowing water pressure decreases, the spindle 3 returns to the stopped state by the force of the return spring 11 (A).
[0017]
As described above, the automatic water supply gas valve 4 opens or closes instantaneously when a predetermined flowing water pressure is reached as the flowing water pressure increases or decreases.
Therefore, when the automatic water supply gas valve 4 is opened, the valve is not opened with a halfway opening, and the necessary opening can be secured and ignition can be performed with a sufficient amount of gas. The release of raw gas can be eliminated.
In addition, when the automatic water supply gas valve 4 is closed, the valve does not close at a halfway opening, but the valve can be instantaneously closed from a sufficient opening, so that the flame disappears with an insufficient amount of gas. It is possible to eliminate the release of raw gas during the valve closing process.
[0018]
Therefore, since the automatic water supply gas valve 4 shown in the present embodiment is integrally formed with a plate-shaped plate spring that snaps itself, a plate-shaped plate spring that performs a snap operation is additionally provided in addition to the automatic water supply gas valve 4. There is no need (the plate-like leaf spring 42 shown in the conventional example of FIG. 4 is unnecessary).
Moreover, by forming integrally, the components (the press collar 41 shown by the prior art example of FIG. 4) which transmit snap operation | movement to a water supply automatic gas valve can be made unnecessary.
As a result, the number of parts can be reduced, the assembly is facilitated, and the gas valve opening / closing device can be manufactured at a low cost.
[0019]
In addition, since there is no need for a component that transmits the snap operation to the automatic water supply valve, there is no sliding resistance generated in the transmitting component, and there is no transmission loss due to a gap provided between the transmitting component and the transmitting component. An instantaneous opening / closing operation by the valve can be performed reliably and efficiently.
[0020]
Further, the gas valve portion of the automatic water supply gas valve 40 in the conventional example (FIG. 4) opens and closes the gas flow path so as to open and close at right angles to the seat surface of the main body, but this embodiment (FIG. 1 or FIG. 2). Then, the plate-shaped leaf spring 2 is bent in the valve opening direction, and warps and opens.
Therefore, it is possible to set the gas valve opening larger than the size of the plate-shaped leaf spring 2, and the water supply automatic gas valve 40 can be made compact.
Therefore, a gas valve opening / closing device that performs a snap-like opening / closing operation can be easily incorporated even in a combustion device having a small gas flow path and a small amount of movement of the spindle 3.
[0021]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention. .
For example, the portion of the plate-like plate spring 2 that molds the gas valve portion 7 made of rubber may be provided with curling or a flat surface at the outer peripheral end in order to improve the adhesion to the rubber material for durability.
[0022]
【The invention's effect】
As described in detail above, according to the gas valve opening and closing device of the present invention, the water supply automatic gas valve itself is integrally formed by the plate-shaped leaf spring that performs the snap operation, so that the snap required in addition to the water supply automatic gas valve is formed. Parts that perform the operation and parts that transmit the snap operation to the automatic water supply gas valve can be eliminated, and the gas valve opening / closing device can be manufactured at low cost.
In addition, since there is no need for parts to transmit the snap operation to the automatic water supply gas valve, there is no loss due to transmission, and the snap-opening operation by the automatic water supply gas valve can be performed reliably and efficiently. There is an excellent effect that the function of the gas valve can be further improved.
[Brief description of the drawings]
FIG. 1 is a schematic view of a gas valve opening / closing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic view showing the operation of the automatic water supply gas valve according to the embodiment of the present invention.
FIG. 3 is a graph showing a relationship between a load and a stroke according to an example of the present invention.
FIG. 4 is a schematic view of a conventional gas valve opening / closing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Water pressure responsive device 2 ... Plate-shaped leaf | plate spring 3 ... Spindle 4 ... Water supply automatic gas valve 5 ... V spring 6 ... Seal part 7 ... Gas valve part 8 ... Metal fitting 9 ... Reset part

Claims (1)

A spindle that moves back and forth in response to flowing water pressure,
In the gas valve opening and closing device equipped with a water supply automatic gas valve that opens and closes the gas flow path in conjunction with the spindle,
The automatic water supply gas valve includes a disc-shaped plate spring curved in the valve closing direction, a seal portion that keeps airtightness between the spindle inserted into the center hole of the disc-shaped plate spring, and an outer peripheral side of the disc-shaped plate spring. A gas valve part that is provided in the downstream direction of the gas flow path and opens and closes the gas flow path is integrally formed,
A push fitting that pushes the plate-like leaf spring in conjunction with the spindle that moves forward by an increase in flowing water pressure, and snaps and opens the plate-like leaf spring to the upstream side; and
A reset unit that is fixed to the gas flow path, restricts the movement of the disc-shaped leaf spring that moves backward due to a decrease in flowing water pressure, and snaps the disc-shaped leaf spring curved to the upstream side to be bent downstream by snapping. And a gas valve opening and closing device.

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